Glad to hear we were able to get you up and running. Please feel free to post again if you have any other needs.
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Hello meeman, it sounds like your modem may need to be updated on the back end. There are times when you receive a new modem and install it that the MAC address does not update in the back end system, in this case we can send a provisioning signal to your new modem and get your Xfi status updated so that you can use the Xfi features. To provision your modem I will need to verify your account, please send me a private message with your full name, street address, and account number by clicking on my name (ComcastAmir) and then "private message me".
I also am having a simaler issue. Updated my modem and was able to log into and see XFi once. After that all I get is a error that says that there are techincal issue. Reached out 2 weeks ago to Comcast support and I am being told that one of my cable boxes is identifying as a second modem and that is causing my problem and that someone from comcast will be calling me. Well, 2 weeks and not a peep out of comcast. Called again last night and got same story